An example of an organism that provides evidence that matter and energy can be cycled through an ecosystem without sunlight is a chemosynthetic bacteria. Chemosynthetic bacteria are capable of using inorganic compounds, such as hydrogen sulfide, as a source of energy to convert carbon dioxide into organic matter. These bacteria are typically found in deep-sea hydrothermal vents or other environments where sunlight cannot penetrate. Their presence and ability to convert non-sunlight energy sources into organic matter demonstrate that ecosystems can sustain themselves without reliance on sunlight.
